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UNITED STATES PATENT OEEICE.

ALBERT HOLBROOK,

MACHINE-BELTING.

SPECIFICATION forming part of Letters Patent No. 417,558, dated December 1'7, 1889.

Application filed September 20, 1889. Serial No. 324,529.' (No specimens.)

To all whom it may concern:

Be it known that I, ALBERT HoLBEooK, Jr., of the city of Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Machine-Belting, of which the following is a full, clear, and exact description, reference `being had to the accompanying drawings,

' self to the groove in the pulleys, and will also possess greater strength than textile beltin g as heretofore constructed.

Figure 1 is a view of a doubled strip of woven textile material secured together by sewing and adapted to form a round belt by twisting the same. Fig. 2 is a sectional View of the strip shown in Fig. l, showing the manner of folding the saine and uniting the folded fabric by sewing. Fig. 3 is a View of the twisted textile-fabric belting.

fold 6, so as to bring the edges 5 5 over the first fold at a point beyond the center of the folded strip, thus forming a strip consisting of six thicknesses of the woven fabric at one edge and extending over and beyond the center of the strip to the edges 5 5, beyond which the so-folded strip consists of four thicknesses of the-woven fabric. .The so-folded fabric is now sewed together along the center 8 with strong thread, so as to firmly hold the six thicknesses together along the center of the strip. The strip shown in Figs. 1 and 2 is now twisted into the round belting shown in Fig. 3. The edge 7 of four thicknesses bends readily over the edges 5 5, which in the twisted round belt form the inner core of the belting. The sewing unites all the layers firmly together. The strain on the belt is sustained equally by all the six thicknesses of the fabric. This equalizing of the strain is materially facilitated by the peculiar Inanner of folding the woven fabric by which one edge is made of less thickness than the rest, so that in twisting the core or inner layers will not be upset and all the strain be exerted on the outer layers or sheets of the folded material.

Having th us described myinvention, I claim as new and desire to secure by Letters Patent- Around belt consisting of asheet 0f woven textile material doubled and folded to bring the edges 5 5 beyond the center of the folded strip, one edge of the folded strip consisting of four and the opposite edge of six thicknesses sewed together along the central portion of the strip and twisted, as described.

ALBERT HOLBROOK, JR.

Witnesses:

JOSEPH A. MILLER, JOSEPH A. MILLER, Jr. 

